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DISCUSSION: <br /> • TPHg was detected in two of five wells sampled this quarter at concentrations of 136 ppb (ATR-5) and 2,350 <br /> (ATR-8) Benzene was reported in one of the five wells sampled this quarter at a concentration of 1 28 ppb(ATR- <br /> 5) MtBE was reported in three of the five wells sampled at concentrations ranging from 17 5 ppb in well ATR-7 to <br /> 636 ppb m well ATR-4 Wells ATR-9 and ATR-12 have been inaccessible over the Iast several sampling events <br /> and could not be gauged and sampled Wells ATR-3, ATR-4,ATR-5, ATR-9 and ATR-12 will be resurveyed and <br /> repaired prior to the first quarter 2001 sampling event Based on currently available data,groundwater elevations <br /> across the site increased by an average of 0 53 feet this quarter The groundwater flow was to the east-northeast at <br /> a gradient of 0 003 fdit Attachment A contains SVE/AS system operational data <br /> ATTACHMENTS: <br /> • Table 1 -Groundwater Elevation and Analytical Data <br /> i <br /> • Table 2-Historical Groundwater Oxygenate Data <br /> • Table 3-Historical Groundwater Gradient Data <br /> • Figure 1-Groundwater Elevation Contour Map <br /> • Figure 2-Groundwater Chemical Results <br /> • Attachment A-Remedial System Performance Evaluation <br /> • Attachment B -Field and Laboratory Procedures <br /> • Attachment C-Certified Laboratory Analytical Reports,Cham-of-Custody Documentation,and Field <br /> Data Sheets <br /> . cc Mr Marty Hartzell,California Regional Water Quality Control Board-CVR <br /> Mr Harlin Knoll,San Joaquin Public Health Services <br />